Vertical type sinter cooler and sinter cooling method

Abstract

The invention discloses a vertical type sinter cooler and a sinter cooling method. A plate type ore feeder unloading type vertical cooler comprises a material bin (1), a material distribution pipe (2), a tower, a plurality of discharge conical hoppers (5), an air ring (H), an air cap (M) and a hot air outlet (8). The tower comprises a tower top cover (3) and a tower wall (4). The discharge conicalhoppers (5) are located below the tower wall (4). The hot air outlet (8) is formed in the upper portion of the tower wall (4) or in the tower top cover (3). The top cover (3) is fixedly connected with the upper end of the tower wall (4). The material bin (1) is arranged above the top cover (3). The upper end of the material distribution pipe (2) is connected with the bottom of the material bin (1). The lower end of the material distribution pipe (2) stretches into the place below the top cover. The multiple discharge conical hoppers (5) are distributed annularly at the lower end of the towerwall (4) or are distributed evenly in the peripheral direction. A circle of fixed gap is formed between the lower portion of the tower wall and the tops of the multiple discharge conical hoppers (5) and serves as the air ring (H). The air cap (M) upwards stretching into the inner space of the tower is arranged in the bottom center of the tower, and a plate type ore feeder (12) is arranged below each discharge conical hopper (5).

Description

technical field [0001] The invention relates to a vertical sinter cooler and a sinter cooling method, belonging to the fields of ironmaking and environmental protection. Background technique [0002] In the modern sintering process, "cooling" is one of the most critical processes. After the sintered ore has been roasted by the sintering machine, it has formed a high-temperature finished ore. How can it be protectively cooled without affecting its quality and yield, so that it can be sent to the finished product ore bin through a belt conveyor, and at the same time The perfect recovery and utilization of the sensible heat energy it carries has always been a problem that technicians in the industry have been constantly studying. Since the 1960s, the cooling process of sinter has been developed rapidly, which is mainly divided into three categories: belt cooling, ring cooling and disk cooling. In the late market competition, the strip cooling technology was eliminated, and th...

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Problems solved by technology

No matter which way you choose, it will cause a high investment cost, which is not cost-effective in terms of economic indicators;

[0007] 2) The open circulation of the air flow leads to low utilization rate of waste heat and pollutes the environment: Since the air flow of the "extraction type longitudinal plate cooling technology" is an open circuit circulation, the air from the waste heat boiler is directly exhausted and not recycled, resulting in more than 100 Sensible heat of the air at a high temperature is wasted, and the discharged air contains a large amount of small particles of dust, causing a certain degree of particulate matter pollution to the atmosphere;

[0008] 3) The material at the feed inlet is severely worn: due to the "ventilated longitudinal plate cooling technology" that sets the material seal at the feed chute, there will be a friction distance between the lower part of the material seal and the upper layer of the material surface in the plate cooler box

At this time, the sintered material is easily pulverized and broken when it is rubbed under the double-layer harsh working conditions of high temperature and upper material column extrusion, thereby reducing the yield of the sintering machine;

[0009] 4) The environmental pollution is serious: due to the negative pressure ventilation technology adopted in the "ventilation type longitudinal plate cooling technology", it does not set a sealing cover device at the lower tray of the box body

In this way, when the sinter is scraped off by the scraper device, it is easy to cause a large number of fine particles and dust to splash

And once the exhaust fan breaks down, all the material dust pushed around the plate cooler will enter the atmosphere, causing extremely bad impact on the operating environment beside the machine;

[0010] 5) The thermal efficiency of the waste heat boiler has not reached the highest: because the "ventilated longitudinal plate cooling technology" does not accurately classify the air passing through the material layer according to the air temperature, but mixes it all into the waste heat boiler, so when the outlet air temperature of the low temperature section is too low , it will inevitably lower the temperature of the air entering the waste heat boiler, thereby reducing the thermal efficiency value of the waste heat boiler

No matter which cooling method is used, the cooling machine has problems such as large air leakage rate, high fan power consumption, low sensible heat recovery rate, and low boiler thermal efficiency.

In other words, in the current environment where the market has increasingly stringent requirements for energy saving and green manufacturing in sinter production, the original equipment structure has been difficult to achieve efficient recovery and utilization of sinter sensible heat

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